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Let int (cos x dx)/(sin^3 x (1 + sin^6 x...

Let `int (cos x dx)/(sin^3 x (1 + sin^6 x))^(2/3) = f(x), (1 + sin^6 x )^(1/lambda) + C` then find the value of `lambda f(pi/3)`

A

`-9//8`

B

`9//8`

C

2

D

`-2`

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The correct Answer is:
D
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